Automatic switch for film rewinders



July l2 1927- J, A. HUDSON AUTOMATIC SWITCH FOR FILM REWINDERS Filed March l. 1926 7 ,o lll/4::`` 3 .I

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`r l G 3. I6. 4. gwuentoz WMM" Patented .luly l2, 1927.

minis` A. Hobson, oi?"nomina,` TEXASI Applicativi; inea'm'rchi, 1192s." seri'a'ino. 9:11374.

This invention is an automatic switch for film reWi'riding'r n'iachine's., as used for re- Winding iiioiiingfpicture ih'ns; andl the obf jectof the; invention is to' provide a simple, practical 'and eilicientautomatic switch for stopping the motor-'driven reivinding.man

chine'"whenv the reel of yfilm is completelyy rewoundyor when the tihn'is' being Wound too looselvoi'v incase the film should break.

In the" drawing y l l Figure'l" isfaside elevation' of the switch mechanism'y shown in association with the m'otoifclriven rewinding reel and the del lire ng' reel;y p v Figure 2 is aplan View of the assembly;

n igure 3'is a rearelevationof the' switch mechanism'detached from the reels, showing the switch closed;

Figure 4f is a View' similar to Figure 3,`

showing the'switclh open. g p

The?` invention f is forv usey 1n connection with the delivery reel 1, from which the film Q'is beingreiiound'ponto the receiving reel' 3 bymeans of' an electric 1notor41"transnntting its' power through the belt 5to the said receivingy reel 3Q vThe' invention proper coni# prises a' pedestal' 6 nnninted`between and in' alignment With'the two mentioned film reels, Journaled through the top of thisv pedestalisa short shaft 7. and a trip arm `8 is rigidly attached at one end of this shaft, the shaft connecting with the arm at an approximate medial point on the arm. A roller 9 is journaled on a pin l0 set in one end of the arm 8, and the opposite end of the arm 8 is counterbalanced as shown at 11, whereby the normal tendency of the arm 8 is to assume an approximate vertical position. rial is mounted upon the opposite end of the shaft 7 and an elongated electrical contact element 13 is mounted upon this drum. The insulated spring terminals 14 of the electrical conductors 1.5 which runfto the motor 4 are fastened to the pedestal 6 and adapted to bear against and engagey the drum 12 and the contact 13 in such position 'that when the roller 9/is'depressed beneath the ystrip of film 2` running between the reels 1 and the circuit will be closed through the conductor 15; but upon ythe film being completely unwound fromkthe reel 1,`or

upon its breaking or running too loose, the

A drum 12 of insulation matecircuit through the conductor 15 and so stop tlie motorl andr t'he'reel 3f y e .'Whi'lej li have herein described a certain specific manner and method' ofcoiistructing and*v assembling the elefii'ientsof my inventiongit `is yiinderstood that lf may vary .fromv tli p sa n minidetailsinot departing from" the yspirit offniyinvention, sowas best to construct a practical device for the purpose intended, asdeined inthe appended claimSQ I claim: 1 l y 1;. iil combination with afilin delivering reel and anielectrically driven ilm'preceiving reehan automatic switch mountedl bei tweelnthe'two'reels and in aligniiint thefrei With; thesaid switch' comprising af pedestal; shaft journaled through the top of the pedestal; atrip arm rigidly mounted at one end'of vthe shaft,v the shaft connecting (with thefarni' at'V medial point on the arm; a roller journaled at one/,end oftliearm and adapted tobe disposedfbeneath thestiipof film' running" between' the'v two `reels; a" countei'nicightcattheopposite end ofthe arm adapted to nor'mallT swing the arni' to a vertial position; kaL drum"V offinsiilation upon'ltheoIjposite end of the said shaft; anl electrical L Contact element" mounted e upon thesa'id dfiuiiji df" insulation; the' 'terminals of the' electrical!conductors leading to the" said motor being so mounted relative to the said contact element as to bear against the said drum and contacty element so that the circuit through the conductors will remain closed with the said trip arm standing in an approximate horizontalposition, but will be broken upon the arm assuming its normal vertical position.

2. In a device of the kind described the combination with a pedestal and a shaft journaled through the (op of the pedestal of a counterbalanced trip arm at one end of the shaft; a film contact element at the vend of the arm opposite to the counterbalanced end thereof, the said film contact element being adapted to bear against the kunderside of the film; a drum of insulation (ill broken upon the arm assuming its normal vertical position.

3. In a device ot' the kind described and in combination with tihn delivery and receiving reels with a strip of iilm connecting the tivo; an automatic switch comprising a pedestal positioned between the reels; a Y#haft Vjournaled through the pedestal; a rip arm at one end of the shaft, the said arm being' `ioincd to the shat't at a medial point ot' the arm; a countcrweight at one end ot the arm to normally throw the arm to a vertical position; a roller at the opposite end otl the arm adapted to traverse the under side ot the strip ot connecting film; a drum of insulation mounted on the other end of the said shaft; an electrical contact element mounted upon the said drum; and electrical conducting elements mounted relative to the said contact element so as to bear against the said drum and contact element so the circuit through the conductors will remain closed with the said trip arm standing in an approximate horizontal position, but will be broken upon the arm assumingits normal vertical position.

d. In a tihn reivindingl mechanism embodying electrically operated tilm delivery and receiving` reels and a strip of iilm runningl from the former to the latter; a device of the kind described; comprisingl a trip arm pivotally mounted at a medial point of the arm and adapted to rotate in a vertical plane; an element at one end ot' the arm adapted to traverse the under side ot the said strip ot iihn; a counterweight at the opposite end ot' the said arm adapted normally to rotate the arm to a vertical position; and an insulated contact drum connected to and rotating with the said trip arm, the said contact drum being so coordinated ivith the electric conductors ot' the mechanism as to close the circuit therethrough when the said trip arm is in an approximate horizontal position with the said traversing element at the under side ot" the strip ot iilni, and to break the circuit when the trip arm is released from the tilm and assumes its vertial position through the action ot the said counterweight.

5. ln a iilni rewindingl mechanism embodying electrically operated lilni delivery and receiving reels and a` strip ot Iilm run ning from the former to the latter; the combination with a traversing clement adapted to engage the underside of the said iilm ot a trip arin pivotally mounted at a medial point ot the arm and adapted to rotate in a verti'al plane and having the said traversing; element mounted at one end of the said trip arm; a counterweight at the opposite end ot' the said arm adapted normally to rotate the arm to a vertical position; and an insulated contact drum connected to and rotating with the said trip arm, the said contact drum being so coordinated with the electric conductors ot the mechanism as to close the circuit there through when the said trip arm is in an approximate horizontal position with the said traversinga element at the under side of the strip ot' film, and to break the circuit when the trip arm is released trom the film and assumes its vertical position through the action of the said counter-Weight.

`ln testimony whereof I atlix my signature.

JAMES A. HUDSON'. 

